90% of the time I use duty finder to join groups. However, there are times that I want to invite linkshell members or people that send tells and it takes me a while to invite them.

Here are the ways I know how to invite people
1. The most efficient way I know to invite people is by doing something like press start->social list->friend list->press square on person->invite to party
2. Select person in the world->press square on person->invite to party
3. Press start->social list->player search->type person's first or last name in->press square on person->invite to party

Does anyone know of faster and easier ways to invite people on PS3?